It is another way oggetting another chatter to talk to you, but it is considered to be rude unless you have no choice to, which is usually when no matter what you have said in the chat, everyone is still ignoring you even though you have not typed anything rude or insulting.
Chat Abbreviations To cut down time on typing, many people have started using abbreviations for various actions and phrases.
When in IRC chats there's the "/me" command to do your actions.
Just type it in like this: /me your action here, and it will print out your name and the action you just did.
Just keep in mind however that things can happen in a chat just as they do outside. Just as the name implies, cheating can happen on a computer just as in real life.